Love both, but I'm inclined to say Australia as I loooove the climate (most of the time) and natural beauty of beaches, springs, forests, deserts, mountains, etc. - which I know Canada has a lot of too, though generally capped with snow.
For clarification, Australia's animals are sooo not that bad! I've spent time in the outback this year and along the north-eastern coast as well as the northern Whitsunday islands and nothing ever tried to kill me. Camping in remote areas, the worst thing I saw was legit a tiny spider - no snakes, no sharks, etc. We even went swimming with crocs, like it's seriously fine!